﻿
using UnityEngine;

/// <summary>
/// Tween the camera's field of view.
/// </summary>

[RequireComponent(typeof(Camera))]
[AddComponentMenu("UGUI/Tween/Tween Field of View")]
public class UGUITweenFOV : UGUITweener
{
    public override object fromValue { get { return from; } set { from = (float)value; } }
    public override object toValue { get { return to; } set { to = (float)value; } }

    public float from = 45f;
	public float to = 45f;

	Camera mCam;

    public Camera cachedCamera { get { if (mCam == null) mCam = GetComponent<Camera>(); return mCam; } }

	/// <summary>
	/// Tween's current value.
	/// </summary>
	public float value { get { return cachedCamera.fieldOfView; } set { cachedCamera.fieldOfView = value; } }

	/// <summary>
	/// Tween the value.
	/// </summary>
	protected override void OnUpdate (float factor, bool isFinished) { value = from * (1f - factor) + to * factor; }

	/// <summary>
	/// Start the tweening operation.
	/// </summary>
	static public UGUITweenFOV Begin (GameObject go, float duration, float to)
	{
        UGUITweenFOV comp = UGUITweener.Begin<UGUITweenFOV>(go, duration);
		comp.from = comp.value;
		comp.to = to;

		if (duration <= 0f)
		{
			comp.Sample(1f, true);
			comp.enabled = false;
		}
		return comp;
	}

	[ContextMenu("Set 'From' to current value")]
	public override void SetStartToCurrentValue () { from = value; }

	[ContextMenu("Set 'To' to current value")]
	public override void SetEndToCurrentValue () { to = value; }

	[ContextMenu("Assume value of 'From'")]
	void SetCurrentValueToStart () { value = from; }

	[ContextMenu("Assume value of 'To'")]
	void SetCurrentValueToEnd () { value = to; }
}
